温度变送器在工业自动化领域中已得到了广泛的应用。我国广泛使用DBW型温度变送器,但随着生产发展的需要,它不能满足在易燃气体坑道中使用要求。本文介绍的是一种低功耗和在壳体充氮方法的新型温度变送器,文章重点介绍测量线路、放大电路、U/I变换器的原理及参数选择。 Temperature transmitters in the field of industrial automation has been widely used. DBW type temperature transmitter is widely used in our country, but it can not meet the requirements of using in the flammable gas tunnels with the needs of the development of production. This article presents a new low temperature transmitter and method for nitrogen filling in the housing. This article focuses on the principle and parameter selection of the measuring circuit, amplifier, U / I converter.